JPS593907A - Molded transformer - Google Patents
Molded transformerInfo
- Publication number
- JPS593907A JPS593907A JP57110769A JP11076982A JPS593907A JP S593907 A JPS593907 A JP S593907A JP 57110769 A JP57110769 A JP 57110769A JP 11076982 A JP11076982 A JP 11076982A JP S593907 A JPS593907 A JP S593907A
- Authority
- JP
- Japan
- Prior art keywords
- shield layer
- coil
- sections
- shield
- molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、課電中モールドコイルの表面に人体が触れて
も安全々表面シールドつきモールド変圧器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molded transformer with a surface shield that is safe even if a human body touches the surface of the molded coil during energization.
第1図は従来の一般的なモールド変圧器の構成例を示す
図で、1は鉄心、2はこれに組合されたモールドコイル
である。第2図はそのモールドコイ、ルの斜視図、第6
図はそのA −A’断面図であり、この図に示すように
モールドコイル2は素コイル6を絶縁樹脂層4で被覆し
て構成され、ライン端子5、タップ端子6を除いて完全
に絶縁されている。しかし、このような通常のモールド
変圧器では、第4図に等価回路で示すようにコイル導体
と大地との間に絶縁樹脂層4による静電容量C1のほか
、樹脂層表面と天地間の静電容量C2が存在する。この
ため、モールド変圧器が課電されているとき、樹脂層表
面はかなり高い電位になっており、樹脂層表面に人体が
触れると感電する恐れがあった。FIG. 1 is a diagram showing an example of the configuration of a conventional general molded transformer, where 1 is an iron core and 2 is a molded coil combined with the core. Figure 2 is a perspective view of the molded coil, Figure 6
The figure is a sectional view taken along line A-A', and as shown in this figure, the molded coil 2 is constructed by covering a bare coil 6 with an insulating resin layer 4, and is completely insulated except for the line terminal 5 and tap terminal 6. has been done. However, in such a normal molded transformer, in addition to the capacitance C1 between the coil conductor and the ground due to the insulating resin layer 4, as shown in the equivalent circuit in Figure 4, there is also a static capacitance C1 between the resin layer surface and the top and bottom. A capacitance C2 exists. Therefore, when the molded transformer is energized, the surface of the resin layer has a considerably high potential, and there is a risk of electric shock if a human body touches the surface of the resin layer.
この危険を除くために考え出された表面シールドつきモ
ールドコイル(特願昭56−179670)を第5図に
示す。この表面シールドつきモールドコイル2′は、素
コイルを被覆しだ絶縁樹脂層4の表面に、ライン端子5
、タップ端子6の周辺を除き、アルミニウムまたは亜鉛
を溶射し、厚さ20〜200μmの導電体皮膜からなる
シールド層(余1線を付して示す)7を形成したもので
ある。8はシールド層7が鉄心の周囲に1ターンを形成
するのを避けるため、円周上の1箇所に設けた狭隙(シ
ールド層がガい部分)であり、このシールド層7をアー
ス線9に接続することにより、課電中もモールドコイル
表面の大部分をゼロ電位に保って感電を防止する。FIG. 5 shows a molded coil with a surface shield (Japanese Patent Application No. 56-179670) devised to eliminate this danger. This molded coil 2' with a surface shield has a line terminal 5 on the surface of an insulating resin layer 4 that covers the bare coil.
, aluminum or zinc is thermally sprayed except for the periphery of the tap terminal 6 to form a shield layer 7 (shown with an extra line) made of a conductive film having a thickness of 20 to 200 μm. 8 is a narrow gap (a part where the shield layer is loose) provided at one place on the circumference in order to prevent the shield layer 7 from forming one turn around the iron core, and this shield layer 7 is connected to the ground wire 9. By connecting to the molded coil, most of the surface of the molded coil is kept at zero potential even during energization to prevent electric shock.
しかし、シールド層を形成する導電体皮膜の線膨張係数
は一般にモールドコイル
それと異なり、線膨張係数がモールドコイル形樹脂(た
とえば日立製作所商品名新MTレジン線膨張係数2.6
xio /lのそれに近いアルミニウム(線膨張係数
2,3X10 /℃)tたは亜鉛(線膨張係数3.3
x10 /℃)等の溶射皮膜を用いた場合でも、コイ
ルの通電、休止に伴う温度変化に対しシールド層と樹脂
層とが異なる膨張収縮量を示し、この膨張収縮量の差が
ある限度以上になると、シールド層と樹脂層との境界に
おいて剥離が起こる。まだ、溶射直後に皮膜が冷却硬化
していく過程で、皮膜の空気に接した面は早く温度降下
し、樹脂層に接した面の温度降下が遅いため、両面の収
縮速度の差によって皮膜内部に樹脂層から剥離しようと
する応力が発生する。これらの原因により、従来技術で
はシールド層の表面積が大きい大形のモールドコイルに
なるほど、シールド層の剥離が起こりやすく、安定した
表面シールド層の形成が困難であった。However, the linear expansion coefficient of the conductive film forming the shield layer is generally different from that of the molded coil, and the linear expansion coefficient of the molded coil type resin (for example, Hitachi's new MT resin has a linear expansion coefficient of 2.6).
Aluminum (linear expansion coefficient 2.3 x 10 /℃) or zinc (linear expansion coefficient 3.3
Even when using a thermal spray coating such as x10/℃), the shield layer and the resin layer exhibit different expansion and contraction amounts due to temperature changes when the coil is energized and stopped, and the difference in expansion and contraction amount exceeds the limit. Then, peeling occurs at the boundary between the shield layer and the resin layer. In the process of cooling and hardening the film immediately after thermal spraying, the surface of the film in contact with the air drops in temperature faster, and the surface in contact with the resin layer drops in temperature slower. A stress is generated that tends to cause the resin layer to peel off. Due to these causes, in the conventional technology, the larger the surface area of the shield layer and the larger the molded coil, the more easily the shield layer peels off, making it difficult to form a stable surface shield layer.
本発明の目的は、上記の困難を排して長期間安定した感
電防止機能を維持でき、より安全性の高い表面シールド
つきモールド変圧器を提供することにある。An object of the present invention is to eliminate the above-mentioned difficulties and provide a molded transformer with a surface shield that can maintain a stable electric shock prevention function for a long period of time and has higher safety.
前述した温度変化に伴うシールド層と樹脂層の膨張収縮
量の差および溶射皮膜の冷却硬化時に両面の収縮速度の
差によって生じる応力の大きさは共にシールド層1個当
りの平面寸法に比例すると考えてよい。本発明ではこの
点に着目し、モールドコイルの表面シールド層を形成す
る導電体皮膜を、コイル周方向に2以上、コイル軸方向
に2以上の合計4以上の区画に分割して設けることによ
り、実効的なシールド層1個当りの平面寸法を縮小して
、膨張収縮量の絶対値の減少を図ったものである。It is believed that the stress caused by the difference in the amount of expansion and contraction between the shield layer and the resin layer due to the temperature change mentioned above and the difference in the shrinkage rate on both sides when the thermal spray coating is cooled and hardened are both proportional to the planar dimension of each shield layer. It's fine. The present invention focuses on this point, and by dividing the conductive film forming the surface shield layer of the molded coil into two or more sections in the coil circumferential direction and two or more sections in the coil axial direction, a total of four or more sections, The effective planar dimension of each shield layer is reduced to reduce the absolute value of the amount of expansion and contraction.
以下、本発明の実施例を第6図によって説明する。An embodiment of the present invention will be described below with reference to FIG.
モールドコイルの樹脂層表面にシールドのだめの導電体
皮膜を形成する方法としては、導電性塗料の塗布、メッ
キ、溶射など種々考えられるが、−例として亜鉛溶射に
よる場合について述べる。Various methods can be considered for forming the conductive film of the shield on the surface of the resin layer of the molded coil, such as coating with conductive paint, plating, thermal spraying, etc., but as an example, zinc thermal spraying will be described.
第6図において、シールド層を設けたくない樹脂層4表
面の端子部周辺と狭隙8、分離帯100部分にはあらか
じめマスキングテープを貼っておき、亜鉛溶射装置を用
いて厚さ20〜200μmの導電体皮膜を形成した後、
マスキングテープを剥がすことにより、ライン端子5、
タップ端子6の周辺を除くモールド−コイルの樹脂層4
の表面に狭隙8と分離帯10とでコイル周方向に2以上
、コイル軸方向に2以上の合計4区画以上に分割された
シールド層(斜線を付して示す)7′を設ける。In Fig. 6, masking tape is pasted in advance around the terminals on the surface of the resin layer 4, the narrow gap 8, and the separation zone 100 where a shielding layer is not desired, and a zinc spraying device is used to coat the resin layer 4 with a thickness of 20 to 200 μm. After forming the conductor film,
By peeling off the masking tape, line terminal 5,
Resin layer 4 of the mold-coil excluding the area around the tap terminal 6
A shield layer (shown with diagonal lines) 7' is provided on the surface of the shield layer 7', which is divided into four or more sections, two or more in the coil circumferential direction and two or more in the coil axial direction, by the narrow gap 8 and the separation band 10.
狭隙8はシールド層7′が鉄心の周囲に1ターンを形成
するのを避けるため、円周上の少なくとも1箇所でシー
ルド層7′を完全に分断するように設け、られる。それ
以外の分離帯10で分割されたシールド層7′のそれぞ
れの区画は細い帯状の導電体皮膜11により1箇所以上
で部分的に他の区画と接続されている。こうすることに
よってシールド層7′のすべての区画を電気的に結び、
共通に接地することができる。In order to prevent the shield layer 7' from forming one turn around the core, the narrow gap 8 is provided so as to completely divide the shield layer 7' at at least one point on the circumference. Each section of the shield layer 7' divided by the other separation strips 10 is partially connected to other sections at one or more points by a thin strip-shaped conductive film 11. By doing this, all sections of the shield layer 7' are electrically connected,
Can be commonly grounded.
シールド層7′は使用状態で人体が接触する可能性のあ
る範囲に設ければ充分であり、人の手が届か々いモール
ドコイルの内周中央部付近はシールドを省略してよい。It is sufficient to provide the shield layer 7' in an area that may come into contact with the human body during use, and the shield may be omitted near the center of the inner periphery of the molded coil where it is difficult for people to reach.
シールド層7′の1区画の大きさは絶縁樹脂層4とシー
ルド層7′の熱膨張係数や各層の厚さなどに応じて定め
、狭隙8と分離帯10の幅は安全性を損なわない程度の
細幅とするこのような表面シールドつきモールドコイル
2を箒1.図と同様に鉄心1と組合せてモールド変圧器
を構成し、シールド層7′のすべての区画をア゛ース線
9により接地して使用する。The size of one section of the shield layer 7' is determined according to the coefficient of thermal expansion of the insulating resin layer 4 and the shield layer 7', the thickness of each layer, etc., and the width of the narrow gap 8 and the separation zone 10 is determined so as not to impair safety. A molded coil 2 with a surface shield having a narrow width of about 1.5 mm is used as a broom 1. As shown in the figure, a molded transformer is constructed in combination with the iron core 1, and all sections of the shield layer 7' are grounded by the ground wire 9.
本発明による表面シールドつきモールド変圧器は、モー
ルドコイル表面のシールド層7がコイル周方向および軸
方向に細分化された導電体皮膜で形成されているので、
コイルの通電、休止に伴う温度変化に際しシールド層と
樹脂層の膨張収縮量の差によって生じる応力の絶対値は
シールド層1区画当りの平面寸法の縮小に対応して減少
し、また、シールド層を溶射皮膜で形成する場合、溶射
皮膜の冷却硬化時に両面の収縮速度の差によって生じろ
応力の絶対値も同様に減少する。このため。In the molded transformer with a surface shield according to the present invention, the shield layer 7 on the surface of the molded coil is formed of a conductive film that is subdivided in the coil circumferential direction and axial direction.
The absolute value of the stress caused by the difference in the amount of expansion and contraction between the shield layer and the resin layer when the temperature changes due to energization and rest of the coil decreases as the planar dimension per section of the shield layer decreases. In the case of forming a thermal spray coating, the absolute value of the stress generated due to the difference in shrinkage speed between both surfaces during cooling and hardening of the thermal spray coating also decreases. For this reason.
シール上゛層の1区画の大きさを適当に定めれば、シー
ルド層が剥離する心配はほとんど々〈々ろ。If the size of one section of the upper layer of the seal is determined appropriately, there is almost no need to worry about the shield layer peeling off.
寸た・、万一外力などによ仁シールド層が傷つけられた
場合でも、部分的に修復することが比較的容易にできる
。Even if the shield layer is damaged by external force, it can be partially repaired relatively easily.
本実施例では、シー、ルド層7′のそれぞれの区画が細
い帯状の導電体皮膜11で部分的に他の区画と接続され
ているだけなので、実効的に独立した区画とほぼ同等と
み々すことができるが、それぞれの区画の間を接続する
帯状導電体皮膜11の位置をずらして一直線上に並ばな
いよう配慮すれば、剥離防止効果□が一層高められる。In this embodiment, each section of the shield layer 7' is only partially connected to other sections by the thin strip-shaped conductive film 11, so that it is effectively almost equivalent to an independent section. However, the peeling prevention effect □ can be further enhanced by shifting the positions of the strip-shaped conductor films 11 that connect the respective sections so that they are not lined up in a straight line.
以上述べたように本発明によれば、モールドコイルの表
面シールド層を形成する導電体皮膜の剥離を効果的に防
止して、長期間安定した感電防止機能を維持できる安全
性の高い表面シールドつきモールド変圧器を提供するこ
とができる。As described above, according to the present invention, the molded coil has a highly safe surface shield that can effectively prevent peeling of the conductive film that forms the surface shield layer and maintain a stable electric shock prevention function for a long period of time. Molded transformers can be provided.
第1図(a)、(b)は従来のモールド変圧器の一例を
示す正面図および側面図、第2図はそのモールドコイル
の斜視図、第6図はそのA、 −A’断面図第4図はそ
の等価回路図、第5図は先行技術による表面シールドつ
きモールドコイルの斜視図、第6図は本発明の一実施例
である表面シールドつきモールドコイルの斜視図である
。
1・・・鉄心
2・・・表面シールドのないモールドコイル2′・・・
表面シールドつきモールドコイル4・・・絶縁樹脂層
5・・・ライン端子6・・・タップ端子
7・・・分割されてないシールド層
7′・・・分割されたシールド層
8・・・狭隙 9・・・アース線1.0
・・・分離帯
11・・・シールド層の各区画の間を接続する帯状の導
電体皮膜
代理人弁理士 中村純之助
1’1図
(Q) (b)
卆2図 卆3・図 矛4図Figures 1 (a) and (b) are front and side views showing an example of a conventional molded transformer, Figure 2 is a perspective view of its molded coil, and Figure 6 is its A, -A' sectional view. FIG. 4 is an equivalent circuit diagram thereof, FIG. 5 is a perspective view of a molded coil with a surface shield according to the prior art, and FIG. 6 is a perspective view of a molded coil with a surface shield according to an embodiment of the present invention. 1... Iron core 2... Molded coil 2' without surface shield...
Molded coil 4 with surface shield...Insulating resin layer
5... Line terminal 6... Tap terminal 7... Undivided shield layer 7'... Divided shield layer 8... Narrow gap 9... Earth wire 1.0
... Separation band 11 ... Band-shaped conductive film that connects each section of the shield layer Patent attorney Junnosuke Nakamura 1'1 Figure (Q) (b) Figure 2 Figure 3 Volume 4 Figure 4
Claims (2)
組合せて構成したモールド変圧器において端子部周辺を
除くモールドコイルの樹脂層表面にコイル周方向に2以
上、コイル軸方向に2以上の合計4以上の区画に分割さ
れた導電体皮膜からなるシールド層を設け、該シールド
層のすべての区画を接地したことを特徴とするモールド
変圧器。(1) In a molded transformer constructed by combining a molded coil covered with an insulating resin layer with an iron core, the resin layer surface of the molded coil, excluding the area around the terminals, has a total of 2 or more in the circumferential direction of the coil and 2 or more in the axial direction of the coil. 1. A molded transformer comprising a shield layer made of a conductive film divided into four or more sections, and all sections of the shield layer are grounded.
膜により部分的に他の区画と接続されていることを特徴
とする特許請求の範囲(1)項記載のモールド変圧器。(2) The molded transformer according to claim (1), wherein all sections of the shield layer are partially connected to other sections by a band-shaped conductive film.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57110769A JPS593907A (en) | 1982-06-29 | 1982-06-29 | Molded transformer |
US06/505,720 US4586015A (en) | 1982-06-29 | 1983-06-20 | Transformer with a surface shield layer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57110769A JPS593907A (en) | 1982-06-29 | 1982-06-29 | Molded transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS593907A true JPS593907A (en) | 1984-01-10 |
JPH0412013B2 JPH0412013B2 (en) | 1992-03-03 |
Family
ID=14544113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57110769A Granted JPS593907A (en) | 1982-06-29 | 1982-06-29 | Molded transformer |
Country Status (2)
Country | Link |
---|---|
US (1) | US4586015A (en) |
JP (1) | JPS593907A (en) |
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JPH02177409A (en) * | 1988-12-28 | 1990-07-10 | Akzo Kashima Ltd | Manufacture of electrostatically shielded transformer |
US5017527A (en) * | 1988-07-20 | 1991-05-21 | Korea Advanced Institute Of Science & Technology | Mechanical seals of SiC-coated graphite by rate-controlled generation of SiO and process therefor |
JPH04116118U (en) * | 1991-03-28 | 1992-10-16 | 田淵電機株式会社 | Planar coil device |
JP2005150264A (en) * | 2003-11-13 | 2005-06-09 | Iq Four:Kk | Lightning resistant transformer and conductive coating single molding coil therefor |
JP2018032717A (en) * | 2016-08-24 | 2018-03-01 | 東芝産業機器システム株式会社 | Stationary induction apparatus |
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US5343143A (en) * | 1992-02-11 | 1994-08-30 | Landis & Gyr Metering, Inc. | Shielded current sensing device for a watthour meter |
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US6445269B1 (en) * | 1996-09-04 | 2002-09-03 | E.I. Du Pont De Nemours And Company | Dry-type high-voltage winding |
KR100348287B1 (en) * | 2000-05-16 | 2002-08-09 | 엘지산전 주식회사 | metal mold structure for molding transformer |
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US11515080B2 (en) * | 2017-01-25 | 2022-11-29 | Delta Electronics (Shanghai) Co., Ltd | Transformer, coil unit and electronic power apparatus |
US11417456B2 (en) * | 2017-01-25 | 2022-08-16 | Delta Electronics (Shanghai) Co., Ltd | High-voltage transformer and electronic power apparatus |
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FR744411A (en) * | 1931-09-02 | 1933-04-20 | ||
US2047159A (en) * | 1935-07-17 | 1936-07-07 | Galvin Mfg Corp | Electrostatic shield |
US2088454A (en) * | 1935-08-02 | 1937-07-27 | Sign Animation Corp | Radiation elimination |
DE1064623B (en) * | 1957-06-14 | 1959-09-03 | Licentia Gmbh | Layer windings with shields for transformers |
US4305115A (en) * | 1979-03-14 | 1981-12-08 | Harry H. Leveen | Electrostatic shield |
-
1982
- 1982-06-29 JP JP57110769A patent/JPS593907A/en active Granted
-
1983
- 1983-06-20 US US06/505,720 patent/US4586015A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5017527A (en) * | 1988-07-20 | 1991-05-21 | Korea Advanced Institute Of Science & Technology | Mechanical seals of SiC-coated graphite by rate-controlled generation of SiO and process therefor |
JPH02177409A (en) * | 1988-12-28 | 1990-07-10 | Akzo Kashima Ltd | Manufacture of electrostatically shielded transformer |
JPH04116118U (en) * | 1991-03-28 | 1992-10-16 | 田淵電機株式会社 | Planar coil device |
JP2005150264A (en) * | 2003-11-13 | 2005-06-09 | Iq Four:Kk | Lightning resistant transformer and conductive coating single molding coil therefor |
JP2018032717A (en) * | 2016-08-24 | 2018-03-01 | 東芝産業機器システム株式会社 | Stationary induction apparatus |
Also Published As
Publication number | Publication date |
---|---|
US4586015A (en) | 1986-04-29 |
JPH0412013B2 (en) | 1992-03-03 |
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